[Black Agnes]

These ‘photographers’ put cameras on their shoes so they can see up your skirt while you’re standing next to them. You needn’t be flashing anyone publically. Just walking on a public sidewalk will do.

[raybbr]

Trolley riders alerted MBTA Transit Police in August 2010 that a man appeared to be taking photographs of women, including one instance in which he appeared to be attempting to photograph a woman’s crotch area, the court said. Transit Police set up a decoy operation the next day involving a female undercover officer wearing a skirt. Robertson allegedly took pictures of her, focusing on her crotch area, and he was arrested, the court said.

Says nothing about cameras on his shoes.

If you are in a public place you can expect no right to privacy. That's been settled many times by the courts.